Process of extracting rosin and other by-products from wood.



W. M. BASHLIN.

mocnss OF BXTRACTING ROSIN AND OTHER BY-PROfiUCTS PROM WOOD.

APPLICATION TILED NOV. 10, 1911. 1,059,261 Patented Apr. 15, 1913.

WILLIAM M. BASHLIN, F GROVE CITY, PENNSYLVANIA.

PROCESS EXTRACTING ROSIN AND O'I'IHER BY PRODUCTS FROMiWOOD.

Specification of Letters Patent.

Patented Apr. 15, 1913.

Application filed November 10, 1911. Serial No. 859,634.

To all whom it may concern Be it known that I, WILLIAM M. BAsHLm,

. a citizen of the United States, residing at taking up the latter in solution,

the vacuum in the Grove City, in the county of Mercer and State of Pennsylvania, have invented new and useful Improvements in Processes of Extracting Rosin and other By-Products from Wood, ofwhich the followingis a specification.

invention relates to a process of exhl'abijting rosin and other byproducts from wood and consists essentially in applying a solvent embodying a mixture of refineclturpentine and deo'dorized benzin to the wood bearing the rosin and other products and and then separating the rosin from the turpentine.

.The invention further consists in applying a mixture of refined turpentine and decolorized benzin to rosin bearing wood and taking up the rosin in solution under the action ot' heat, separating the rosin from the turpentine, and then extracting the residual turpentine from the wood, and conserving the wood as freed from rosin, turpentine and other by-products for use in making paper or other pulp.

In carrying out the process and as an intermediate step to render the extraction of the rosin, turpentine and other products from the wood more effective, the vessel or digester in which the wood is deposited for treatment will have the air withdrawn therefrom or a vacuum established therein. This vacuum is established in the digester or containing vessel after the latter has been charged with the wood reduced to small pieces and .prior to turningonthe heat or subjecting the charge to the action; of heat to provide for a more effective elimination of the rosin and turpentine by the dissolving action of the combined turpentine and deodorized benzin. The process may, however, be carried on in its most simple form without resorting to the establishment of digester and at times when the extraction or elimination of the turpentine, rosin andby-products may be eflectively carried on by the action of the solvent. embodying refined turpentine and deodorized benzin heated within the digester to a desirable temperature.

The preferred form of apparatus for car- 'ryingout the process is shown in the at:- companying drawing.

The numeral 5 designates the main body of the digester or still surrounded by a heating jacket 6 to which steam may be admitted from a suitable source through a pipe 7 having a valve 8. The heating jacket 6 extends around the bottom of the body 5 and upwardly to a dome-like top 9 which is provided with a suitable inlet 10 for charging the digester and also with an outlet pipe 11 for;carrying oil the vaporized products and delivering them to a condensin coil 12 disposed in a tank 1341s usual. he tank 13 has a valved outlet14 connected to the bottom thereof, and the lower extremity of I the coil 12 is projected through the lower portion of the body of the tank 13 and ter- Inmates 1n an outlet cock 15 from which the condensed vaporized products may pass into a suitable receptacle. A pressure gage .16, a thermometer 17, and a liquid level ga e 18 cooperate with the interior of the b0 y 5 of the digester to respectively indicate the steam pressure temperature and level of the liquid within the said body, and the jacket 6 is also provided with a steam gage 19. In the center of the bottom of ing with any suitable form of .separating.

apparatus. On the opposite side of the outlet 20 a valved steam pipe 23 communicates with the bottom of the body of the di ester, said steam pipe receiving its supply 0 steam from the same source as the pipe 7 or from any other steam generating means. A;vacu;

um creating pipe 24 having a suitable valve 25 also communicates with the upper porthe body 5 1s an outlet 20 having a valve 21 that may tion of the body 5 of the digester and may be connected to any suitable form of suction pumpior apparatus for establishing the desired vacuum in the body of the digester.

At a suitable point above the bottom of 1 the body 5 of the digester is a su dumping bottom 26 consisting o a foraminous or other analogous open structure disk which normally divides-the digester into an plemental 50 process is much more effective if thechips upper charge receiving chamberand a lower product receivingchamber, the said dumpingbottom. being pivoted as at 27 to turn and having at'an opposite point a stem'or rod 28 extending through the jacket 6 .and

terminating in an outer handle 29. Cooperating with the rind 28 exteriorly of the jacket 6 is a pawl and ratchet locking mechanism 30 which operates to maintain the dumping bottom 26 in true horizontal position particularly when the weight of the charge of wood is imposed thereon. Supported within the body 5 above the bottom 26 by means of suitable braces or spiders 31 is a distributer consisting of a vertical pipe 32 closed at its upperend and having a plurality of .perforated tubular arms 33.

extending outwardly therefrom in staggered relation. To the lower extremity of the pipe 32 a steam feed or supply pipe 3t is attached and provided with a valve 35, the

' pipe '34 being connected to a' suitable steam A charge of resin bearing-wood in. comsource which may be the same source as that which supplies the pipes 7 and 23 ,o-rany other steam generating medium. In the upper central portion of the top 9 an admission pipe 36 for the solvent is connected and provided with a controlling valve 37.

In preparing the apparatus or digester for carrying out the process the valves 8, 25 and 35, and the valves in the pipes 20, 22 and 23 are closed and the inlet 10 is opened.

minuted condition, such as chips, is then introduced into the body 5 and falls ontothe dumping bottom 6 and also in and around the different parts of the distributer emor comm'inuted wood are flooded with the mixture of turpentine and, benzin. The

inlet 10 is then closed and a vacuumis es tablished in the digester by opening the valve 25 in the pipe 24: through the medium of the vacuum creating apparatus or device to which the said pipe is attached and subsequently the valve 25 is closed and steam permitted .to enter and fill the jacket 6 by opening the valve 8 of the pipe 7 and at the same time the valve in the vapor outlet pipe 11 is opened. The digester is subjected to this heating operation for a sufficient length. of time as may be found by practice in treating difierent kinds of resinous bearing condensed in the coil 12 and pass off into a suitable receptacle. In the first part of the operation, however, the pipe 11 may remain closed and all of the heavier products or those of anon-volatile character will pass through the supplemental bottom 26 and de-- posit in the bottom portion of the digester including the turpentine and deodorized benzin that may remain in the digester, and

all of the material including thev rosin held .within the digester after the steps of the process thus'far explained have'been completed may be drawn off through the pipe 22 and. conveyed to a suitable separating apparatus to recover the turpentine and portion of the. benzin' carried thereby as well as the rosin and other by-products. The turpentine and benzin recovered by the separating operation may be again used for a similar elimination or returned to the pletely treated and withdrawn. operations the digester may be efiectively used with the same solvent mixture withoutestablishing a vacuum, and under such con ditions the valve 25 of the pipe 24 will remain closed and the valve in the pipe 11 may be immediatelyopened when steam is digester after the one charge has been com- In some admitted to the jacket 6 so that the vapors produced may be quickly carried .off and condensed'and their constituents recovered by any of the well known means. After the charge of wood has been treated to eliminate the rosin and other by-products and together with the solvent withdrawn from the digester, steam under pressure is admitted through the pipe 23 and passes up through the charge of wood remaining in the digester to carry ofl all of the solvent mixture that may be still clinging to the wood and this mixture together with the steam passes off in the form of vapor through the pipe 11 and is condensed and subsequently separated, and under this treatment the wood will be entirely freed of any of the products that can be eliminated vby the process explained and is then dumped into the bottom of the digester by turning the bottom 26, and from the bottom of the digester the wood may be withdrawn through the outlet 20 by opening the valve 21 and delivered to any other suitabletreating apparatus or into a pit for the purpose of reducingthe same to pulp by any of the well known alkaline methods.

The'process asthus far described may be carried on efiectively without the cooperapreferred that the distributer be utilized to render the elimination of the rosin and other products inthe wood more positive and certain and above all to quickenthe operation, and therefore during the time that the wood and solvent as hereinbefore specified are subjected to heat from thejacket 6, steam is admitted through pipe 34 by opening ;the valve 35 to the-,pipe 32 and arms 33, and

from the latter passes out through all parts of the charge of wood and heats the latter and the solvent internally while the jacket is heatin the wood and solvent externally, and there ya more rapid elimination of the productsfronrthewood is efliected. When the distributer isused in the first treatment of the wood'with the solvent it may be shut 01f when the second treatment b steam throu h the pipe 23 is pursued su sequent to witlidrawal of the turpentine andremaining benzin and eliminated products, or if desired the distributer may be used to blow steam through the wood in conjunction with the steam enterin throu h said pipe 23 and thereby carry 0 all t e turpentine and other matter remaining in association with the wood that may be vaporized through the pipe 11 into the condenser 12.

The solvent hereinbefore described and embodying refined turpentine and deodorized benzin as its constituents, gives a result which is more advantageous than if the solvent consisted of either of the constituents alone, for the reason that the henzin is more penetrative and is a i more quickly actin extrahent than turpentine, especially in issolving and eliminating the rosin, and the turpentine more perfectly acts to eliminate .the turpentine of the wood or;

material treated by reason of the fact that it is refined and has a greater afiinity for the like product in the wood for which it is used to eliminate. In other words, the turpentine will more'quickly remove theturpentine from the wood or other material, while the deodorized benzin as. above noted cooperates ,with the rosin,

"In view of the difference inspecifi'c gravities of the refined turpentine and deodorized benzin the benzin 1n the first vaporization, due to its higher volatile characteristics, will issue from the still carrying very little of thegturpentine vapor and may be recovered for further use at a comparatively reduced expense and in less time than if mixed with a large quantity of turpentine forreuse as a part of the solvent. Further- -more, it will be observed that deodorized benzin is used in contradistinction to-ordinary benzin having a pungent odor and the advantage in this-particular use is that the eliminated products or the turpentine and rosin are not affected, to any appreciable extent, by a benzm odor. Where gasolene is used as a solvent, the rosin eliminated as well as the turpentine is materially afiected by the objectionable odor of the asolene and it is practically impossible to rid the rosin of such odor, and hence rosin so affected has a materially reduced commercial value. Another factor of importance in favor of the use of deodorized benzin is that explosions within the still are less liable to occur, whereas by the use of asolene the danger of explosion in the still is always present. Therefore the combination of turpentine and deodorized benzin in the solvent gives a quicker or more expeditious elimination of the product sought from the material treated without any deleterious effect on the said product and requiring less time and 'expense in the separation of the products from the solvent. The vacuum feature of this process involving the solvent in cooperation therewith is also important as the wood or other material is dried and the pores opened to give the solvent greater penetrative access to the products inherent to the wood or carried by the material treated so that the wood is more thoroughly cleaned and under the action of a moderate heat the products are .completelyeliminated, thus better preparing the wood for after treatment for pulping purposes. It is obvious that where the wood or material treated is subjected to a vacuum or the still in which it is disposed has a vacuum created therein, less heat is required to obtain a perfect elimination than under other conditions or without a vacuum, and hence the wood is less liable to become scorched or discolored, with material advantages in after pulping operations.

The variations in practising the steps of the process as hereinbefore described provide for the treatment of various kinds of wood, or wood carrying different roducts some of which may be more diflicult 1nelimi nation than others, so that the wood, of whatever nature it may be, will 1 be thoroughly treated and ready for subsequent pulping operations with material advantages from a standpoint of economy and expedition in result.

What is claimed is: e

1. The process of extracting rosin and other by-products from wood, consisting in disposing; a quantity of rosin bearing wood reduced to small pieces in a receptacle, ap-

plying a mixture of about one-fifth turpenucts from wood, conslstin of wood reduce to ppl other pro disposing a quantity smallpieces in a closed receptacle,

2. The process of extracting rosin and a a solvent consisting of refined turpentine and deodorized benzin over and about the.

and by-products from the solvent and reusing the latter in the treatment of a new charge of wood.

3. The process of extracting rosin and other lay-products from wood,- consisting in disposinga quantity of wood reduced to small pieces in a receptacle, applying a solvent embodying refined turpentine and deodorized benzin over the wood, said solvent containingabout one-fifth turpentine, subjecting the solvent and wood to the action of heat, drawing ofi the solvent, rosin and other by-products and separating the several constituents, and injecting steamin and through the wood in the receptacle to carry ofi the solvent and other products remaining in the wood in. the form of a vapor and condensing the latter to separate the constituents thereof, v

4:. The process of extracting rosin and other products from wood, consisting in disposing a quantity of wood reduced to small pieces in a closed receptacle, applying a solvent consist-in of refined turpentine and deodorized benzm in suitable proportions over the wood, said solvent containing about one-fifth. turpentine, establishing a vacuum in the receptacle, subjecting the solvent and oil the a noeaaei the wood to the action of heat, and drawing ofl? the solvent and products eliminated thereby and separating the several constituents of the solution. 7

5. The process of extracting rosin and other products from wood, consisting in solution" embodying the solvent and prod-i nets and separating the latter.

6. The process of. extracting rosin and 7 other products from wood, consisting in disposing a quantity of wood reduced to small pieces in a closed receptacle, admitting a solvent to the receptacle consisting of refined turpentine and deodorized benzin in 'proper proportions to cover the wood, es-

tablishing a vacuum in the receptacle, ex-

ternally and internally heating the wood and solvent, and finally draining oil the solution and products latter.

and separating the In testimony whereof I- have hereunto set my hand in presence of two subscribing wit- W. L, Mnsnn,

)HAS. B. ILEn 

